Pipe-bending machine



May 6, 1930. H. LIBERTY PIPE BENDING MACHINE Filed April 16. 1928 ME Imaany Patented May 6, 1934) UNITED STATS OFFICE HARRY L. LIBERTY, OFCHICAGO, ILLINOIS PIPE-BENDING MACHINE Application filed April 16,

-::= abutment by means of a pivoted roller carrying lever is adapted tobe readily removed from the machine when the lever is swung back intonormal position and the clamping vise is released. 1

It is a further object of this invention to provide a bending machineadapted for use in bending pipes or conduits and having a grooved camand a pivotally supported grooved roller for coaction therewith, withsaid cam and roller both having a segment of one of the groove flangesthereof cut away to aii ord a ready passageway for the insertion of apipe between said cam and roller when the segment edges thereof arepositioned adjacent one another in parallel relation.

It is an important object of this invention to provide a pipe bendingmachine having a pipe gripping vise on which a grooved cam or abutmentis ri idly secured, with said cam having pivotally mounted thereon apipe bending lever carrying a grooved roller adapted to act on aprojecting end ofa pipe held in said vise to bend the pipe around thegrooved cam.

Other and further important objects of this invention will be apparentfrom the disclosures in the specification and the accompanying drawings.

This invention (in a preferred form) is illustrated in the drawings andhereinafter more fully described.

1928. Serial No. 270,217.

Figure 3 is a side elevation of the machine l with the ends of the pipebroken away.

Figure 1 is a. detail section taken on IV-IV of Figure 1 with partsomitted.

' Figure 5 is a diametric section of the bending roller.

As shown on the drawings:

The improved pipe or conduit bending machine comprises a base plate 1having suitable line apertures therein to permit the same to be rigidlysecured to a bench or other support. Rigidly mounted on the base plate 1is an arched frame or yoke 2 forming part of a vise. Adjustably threadedthrough the upper central portion of the yoke 2 is a screw 3 provided with a passaged head 1- through which a vise handle 5 is slidablyengaged. Engaged on the lower end of the vise screw 3 is a plunger orplate 6 with the ends thereof suitably grooved to slidably engage on theupright ides of the yoke 2. Secured to the bottom of the plunger 6 is anupper clamping member 7 provided with a transverse pipe receiving notchat 8. Ptigidly secured to the mounting plate l is a lower clampinprovided with a transverse pipe receiving notch positioned opposite thenotch 8 in the upper clamping member 7.

Rigidly bolted or otherwise secured to one end of the base 1 and to theside of one leg of I the yoke 2 is a flange 10 which is integrallyformed at right angles on the bottom of an arcuate abutment or cam 11.The cam 11 is provided with a curved edge which is grooved at 12. A.segment of the upper flange forming the cam groove 12 is cut away ormutilated from a point adjacent the clamping vise in a line at rightangles to the base of said vise to afford an open'groove along a segmentline 13 to permit an easy entrance guide for a pipe or tube 14 which. isto be bent. Pivotally mounted on a pivotbolt or pin 15 supported on thecam 11 is a lever 16 having a U-shaped bracket 17 integrally formedthereon and carrying a pivot pin or stud 18 on which is rotatablyengaged a peripherally grooved bending roller 19. A segment or are ofthe upper flange of the grooved roller 19 is cut away or mutilated toform a segment edge or line 20 normally adapted to be positioned atsubstan- 9; member 9 also 3' tially right angles to the front face ofthe yoke 2 and opposite and parallel to the segment edge 13 of the cammember 11. Vith the vise in released or open position and with the lever16 positioned substantially parallel to the front face of the vise yoke,the roller 19 is rotated until the segment edge 20 is opposite andparallel to the segment edge 13 of the cam 11 to permit a pipe 14 to beprojected through the vise and through the guide opening affordedbetween the open segments 13 and 20 of the cam and roller, respectively.The vise is then adapted to be closed by means of the handle 5, therebycausing the pipe to be tightly gripped or clamped between the grippingblocks 7 and 9 of the vise.

lVith the machine having the parts posi' tioned as indicated in Figure1, with the pipe projecting through the entrance guide groove affordedbetween the cam and the roller, the lever 16 is adapted to be swung fromits normal position substantially parallel to the base of the vise yoketoward the dotted line position illustrated in Figure 1, thereby causingthe roller 19 to rotate on the projecting end of the pipe to bend thepipe around against the curved grooved surface 12 of the cam or arcuateabutment 11. It will thus be noted that the projecting end of the pipewill be bent into the form of a curved elbow 21. After the pipe has beenbent into the desired form the lever 16 is swung backwardly from thedotted line position in Figure 1 into its normal full line positionafter which the vise is released to permit the bent pipe to be pulledout of the vise through the guide groove afforded between the yoke androller.

The device is of simple form and is adapted to be conveniently operatedto act on pipes, conduits, tubes, or the like to quickly and easily benda portion of a pipe around the curved grooved edge of the stationary camor abutment. The nature of the curve, of course, will depend upon thecurvature of the grooved cam edge of the abutment 11.

I am aware that many changes may be mace, and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and I therefore do not purposelimiting the patent granted hereon, otherwise than necessitated by theprior art.

I claim as my invention:

1. A bending machine comprising a vise adapted to clamp an article whichis to be bent, a grooved cam rigidly secured to said vise and having asegment of one of the groove flanges thereof cut away to form an openguide segment in the cam, a lever pivotally mounted on said cam, and agrooved roller rotatably mounted on said lever, said roiier having asegment of one of the groove flanges thereof cutaway to form an openguide segment and adapted to be positioned opposite the open guidesegment of the cam to afiord an open guide passage for the article whichis to be bent.

2. A pipe bending machine comprising a clamping vise adapted to rigidlyhold a pipe to be bent, a grooved cam rigidly secured thereto with asegment of one flange of the grooved cam cut away, a lever pivoted onsaid cam, and a grooved roller rotatably engaged on said lever andhaving a segment of one of the groove flanges cut away and normallyadapted to be positioned opposite and parallel to the segment of saidcam to afford an open groove for receiving the pipe prior to a bendingoperation of the pivoted lever.

A pipe bending machine comprising means for clamping a pipe to be bent,a stationary multilated grooved cam member adj acent said means, a leverpivoted on said cam member, and a mutilated grooved roller on said leveradapted to coact with said cam to bend the pipe around said cam when thelever is operated.

4. A bending machine comprising means for clamping a pipe to be bent, anabutment rigidly secured to said means having a curved grooved edge witha segment of said grooved edge cut away, a lever pivoted on saidabutment, and a grooved roller on said lever having a segment thereofcut away and normally positioned opposite the segment line of saidabutment to afford an entrance guideway for the pipe clamped by saidmeans.

5. In a pipe bending machine the combina tion with a stationary groovedcam liav 1g a segment of the grooved portion thereof cut away, of agrooved roller having a segment of the grooved periphery thereof cutaway, and means for causing said roller to coact with the grooved cam onan article positioned between said cam and roller to bend the articlearound the grooved edge of said cam.

6. In a pipe bending machine the combination with a grooved cam, of agrooved roller in the plane of said cam and spaced therefrom, saidgrooved cam and roller each having a segment of the grooved edge thereofcut away to afford a receiving guide passage for an article to be bent,and a lever sup porting said roller and pivotally engaged on said camadapted to be operated to cause the roller to bend the article aroundthe grooved edge of said cam.

In testimony whereof I have hereunto subscribed my name at Chicago, CookCounty,

Illinois.

HARRY L. LIBERTY.

